Fix cropping to include last column and last row

[arunppsg]

Fixes #876

Description

I have updated image cropping lines to include last row and column. Earlier the top index was from [0, h - new_h) where h is the height of the image and new_h is the height of the cropped image.

Consider a case where new_h = 3 and h = 4. In this case, top index can only be 0 and hence the last row will never get started. To fix this, I have updated np.random.randint to sample from [0, h - new_h + 1) for choosing last row and for chosing last column, I have update the func to sample from [0, w - new_w + 1)

Checklist

• The issue that is being fixed is referred in the description (see above "Fixes #ISSUE_NUMBER")
• Only one issue is addressed in this pull request
• Labels from the issue that this PR is fixing are added to this pull request
• No unnessessary issues are included into this pull request.

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[NicolasHug]

LGTM, thanks @arunppsg